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A method is described for measuring directly the rate of erosion in the intertidal zone. Basically, this method consists of the implantation of permanent bench marks to which can be attached, at intervals, a specially designed drawing table. This table is used to obtain, over a period
of years, a series of contour drawings of the rock surface. Precautions are taken to ensure that when subsequent contours are to be drawn in a given location, the table is set up in exactly the same position. The apparatus can be used in any circumstance where the measurement of a gradual
erosion or accretion of a hard substrate is desired.
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